Sun protection is very important no matter it is summer or winter. You just need to find the one that suit your need! To help you, here are some tips. The SPF will protect from UVB rays (responsible of sunburns) and the PA will protect you from UVA rays (the one that penetrates deeper in the derma and cause skin aging). You might see Sunblock or sunscreen on different products. Sunblock will block the UVs and prevent tanning while sunscreen will filter the UVs to prevent sunburn, but allow the skin to tan.